| http://www.w3.org/ns/prov#value | - If a glass or other material having an index of refraction much higher or lower than the index of refraction of typical glasses is used for support layer 122, the thickness t should preferably be chosen so that, given the index of refraction of support layer 122 for the wavelengths of beams 44 and 66, a compact disk lens used as lens 114 corrects for the spherical aberration introduced by support
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